Die holder



Aug. 12, 1941. E P, FISHER 2,252,365-

' DIE HOLDER I Filed May 13; 1940 /0 3 a "2 mil 9 INV ENT OR. Z-DWAED J. P P/SHEIE ATTOiP/VEYS 2 but taken on line 3-3 01 Figure l.

Patented Aug. 12, 1941 DIE HOLDER Edward J. P. Fisher, North Jackson, Ohio, as-

signor to The Aetna Standard Engineering Company, Youngstown, Ohio, a corporation of Ohio Application May 13, 1940, Serial No. 334,799

I 4 Claims. This invention relates to wire drawing apparatus and more particularly to an improved water cooled die holder for supporting the die through which the wire is drawn.

The dies used in wire drawing are commonly mounted in holders which in turn are supported in a die box or the like. i The die proper is prelerably so held in the holder that it is easily 'removed and replaced. This permits a single holder to be used for drawing different sizes of wire and also permits the die to be easily replaced when worn. Die holders have been employed in which water is circulated through the holder to remove the heat generated when the wire is drawn through the die. My present invention relates to an improved form of die holder in which the die is supported and engaged over a large part of its surface by a housing or heat conductive material, the outer surface of this housing being-in large measure surrounded by water. The force exerted on the die by the wire .as it is being drawn therethrough is utilized to cause the die to closely engage the wall of the housing and thus increase the efliciency of heat transmission between the die and the heat conducting housing.

It is among the objects of my invention to provide a simple and" effective water cooled die holder which will at all times maintain the die below the desired maximum temperature value. Other objects of my invention include: the provision of means for eflectively cooling a die which may be'employed in either the lubricated or dry type of die holder; the provision, in a liquid cooled die holder, of means for supporting the die in working position whereby the die can readily be removed andreplaced and whereby heat conducting contact is automatically assured during drawing.

The above and other objects of my invention will appear from the iollowing description 01 two embodiments thereof, reference being had to the accompanying drawing, in which- Figure 1 is a vertical longitudinal cross-sectional view, taken on line l-l c! Figure 2, 01' my die holder improvements incorporated-in an oil lubricated type of die holder.

Figure 2 is a transverse vertical cross-sectional view taken on line 2-2 of Figure l.

Figure 3 is a view generally similar to Figure Figure 4 is a cross-sectional view similar to Figures 2 and 3 but taken on line 4-4 01. Figure 1.

Figure 5 is a vertical longitudinal cross-sectional view, generally similar'to Figure 1, but i1 'lustrating my invention as applied to a dry type die holder.

The die holder of Figures 1 to 4 comprises a block or body l having an exit end wall 2 and a threaded opening 3 at the opposite or entering end. The lubricant chamber 4 extends from the threaded portion 3 to the annular rib or web 5 which is followed by the cooling water chamber 6. Anadditional annular cooling :water chamber 1 is provided in the end wall 2 and it will be observed from Figure 1 that the chamber 1 connects to the chamber 6 through a suitable-passage 8. Cooling water is supplied to the inlet opening 9 through a pipe 40 and is removed through the outlet opening and a suitable pipe l2. Wall portions l3 and H (seen in Figures 2 and 3) separate the ends of the generally annular chambers 6 and I respectively, and thus the flow of cooling water is positively directed from the inlet pipe l0, through the generally annular chambers 6 and I, to the outlet pipe l2.

The die housing is best seen in Figure 1 and comprises a tubular wall portion 15 and a disc end portion l6 havinga central aperture 11 to permit the wire II to pass therethrough. Copper or other similarly good heat conducting metal'is preferably used for the wall and end portions l5 and i6 and the disc. I may be soldered or brazed to the tubular portion l5. 'Iheopen end of the tubular portion I! may be brazed to the web 5 or the housing I as at IS. The die 20 is a cylindrical element having a die hole 2| formed therein and is made to have a sliding lit with the tubular portion I5 01 the die housing. Engagement housing therefor. A plurality of angularly dis-. posed holes 24 extend through the wall of the sleeve 22 into the lubricant chamber 4 and an opening 25 is formed in the end'disc 23 to permit the wire to enter and the lubricant to escape. Oil or other. suitable lubricating liquid is discharged into the annular chamber 4 through the pipe 26 and is directed out through the openings 24 against the wire at a point immediately adjacent its point of entry into the die 20. Excess lubricant will pass out or the opening 25 and may be collected in the die box or in other suitable manner. It will be noted that the Opening of the die 20 and the disc I6 is assured at all times during operation and an extremely effective heat conducting action is secured between the die and the copper disc 16. Furthermore, as the die 20 has a fairly snug sliding fit in the sleeve l5, heat is readily conducted from the die into the sleeve 15. As water is maintained in contact with a substantial area oi. both the disc l6 and the sleeve ii an effective cooling action is secured at'all times. I

In Figure a die holder is illustrated which is generally similar to that shown in Figures 1 to 4, except that no provision is made in the holder for lubricating the wire. In this device the body 21 carries the copper sleeve and disc members 28 and 29 and is provided with cooling water passages 30 and 3| in a manner substantially the same as previously described. The die 34 is held in position by a screw plug 32 which is formed with an opening 33 to permit the entry of wire into the die 34. After passing through the die the wire leaves the holder through an opening 35 in the end wall 36 thereof and water is conducted to and from the cooling water chambers 30 and 3| through the pipes 31 and 38.

The cooling results above described are also obtained with. the device of Figure 5 and it will be seen from theabove description that my improved die holder provides an extremely compact and effective structure for supporting and cooling'a wire drawing die.

Although I have described the illustrated embodiments of my invention in considerable detail it will be understood by those skilled in the art that numerous variations and modifications may be made in the apparatus shown without departing from the spirit of my invention. I do not, therefore, wish to be limited to the exact forms thereof herein shown and described, but claim as my invention all embodiments thereof coming within the scope of the appended claims.

I claim:

1. In a dieholder of the type described, a body member, a cooling water chamber formed in said body, a die supporting housing of copper or the like comprising a tubular cylindrical sleeve portion having an end portion, said housing being supported in said body with the outer surface of said end portion forming a portion of the walls of said cooling water chamber, a die having a sliding fit in said supporting housing and having an end face adapted to engage the inner face of said end portion of said housing and a die hole extending therethrough, the exit end of said die hole being adjacent said housing end portion, and means for holding said die in said die housing.

' 2. In a die holder of the type described, a body member, a cooling water chamber formed in said body, a die supporting housing of copper or the like comprising a tubular sleeve portion having an end portion, said housing being supported in said body with the outer surface of said end portion forming a portion of the walls of said cooling water chamber, a die having a sliding fit in said supporting housing and having an end face adapted to engage the inner face of said end portion of said housing and a die hole extending therethrough, the exit end of said die hole being adjacent said housing end portion, means for holding said die in said die housing including a sleeve forming an annular lubricant chamber formed in said body around the path of the wire therethrough, said sleeve having a plurality of lubricant outlet holes positioned to direct lubricant against the wire adjacent the inlet end of said die hole, and means for supplying cooling water to and removing said cooling water from said cooling water chambers.

3. In a die holder of the type described, a body portion, a die supporting housing in said body portion, said housing comprising a tubular portion and a disc end wall portion, cooling water passages in said body contacting said tubular portion and said end wall of said die supporting housing, and a die, having -a, central die hole therethrough, supported in said housing by said cylindrical portion thereof with the axis of the die hole coincident with the axis of the cylindrical portion whereby said die will be forced into intimate heat conducting contact with the disc end wall by the drawing force exerted on said die when a wire is being drawn.

4. A water cooled die'holder comprising a body portion, a tubular die housing supported in said body portion, said die housing having one end open and a disc end plate at the opposite end, said disc having a central aperture to permit the wire being drawn to pass therethrough, said body portion having cooling water passages formed in part by said end plate of said die housing, and a die having a central die'hole and having a sliding fit in said die housing, the exit end of said die hole being disposed adjacent the central aperture of said disc and said die having an end surface adapted to engage the -inner face of said disc over substantially the entire surface area.

EDWARD J. P. FISHER. 

